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Q5 A. Describe a transverse “bow thruster” unit; Mention should be made of where it is fitted, how the propeller hub with shafts and internal bevel gear drive are usually supported and how the maneuvering oil is conveyed to the propeller main servo-motor.  Also, mention how strength thrust and reverse thrust are achieved; B. Give reasons why the standard constant speed non-reversing type electric motor is preferred as the prime mover rather than a diesel engine.